Recordings of narwhal (Monodon monoceros) echolocation signals were made using a linear 16 hydrophone array in the pack ice of Baffin Bay, West Greenland in 2013 at eleven sites. An average -3 dB beam width of 5.0° makes the narwhal click the most directional biosonar signal reported for any species to date. The beam shows a dorsal-ventral asymmetry with a narrower beam above the beam axis. Thi...

A bioenergetic model for two narwhal (Monodon monoceros) sub-populations was developed to quantify daily gross energy requirements and estimate the biomass of Greenland halibut (Reinhardtius hippoglossoides) needed to sustain the sub-populations for their 5-month stay on wintering grounds in Baffin Bay. Whales in two separate wintering grounds were estimated to require 700 tonnes (s.e. 300) and...

Isopod parasites of the subfamilies Ioninae and Pseudioninae infest the branchial chambers of brachyuran crabs. In total, 19 species of parasitic isopods infest crabs from China; they belong to 6 genera from the Ioninae and 1 genus from the Pseudioninae. Specifically, the following genera are represented: Allokepon Markham, 1982 (three species), Apocepon Nierstrasz and Brender à Brandis, 1930 (...

We present a scenario for the production of dynamically cold rings around the Milky Way via a high– eccentricity, flyby encounter. These initial conditions are more cosmologically motivated than those considered in previous works. We find that the encounters we examine generically produce a series of nearly dynamically cold ring–like features on low–eccentricity orbits that persist over timesca...

Some Metapenaeus monoceros cox1 gene fragments were isolated, purified, sequenced, and comparatively analyzed with some other Crustacean Cox1 gene sequences (obtained from National Center for Biotechnology Information). This work was designed for testing the efficiency of this system in reconstruction of phylogenetic relations among some Crustacean species belonging to four genera (Metapenaeus,...

If cosmic rays with energies <100 TeV originate in the galaxy and are accelerated in shock waves in shell-type supernova remnants (SNRs), gamma-rays will be produced as the result of proton and electron interactions with the local interstellar medium, and by inverse Compton emission from electrons scattering soft photon fields. We report on observations of two supernova remnants with the Whippl...

We study the large-scale magnetic field structure and its interplay with gas dynamics in Monoceros OB1 East molecular cloud. combine observations of dust polarised emission from Planck telescope CO line Taeduk Radio Astronomy Observatory 14-metre telescope. calculate strength plane-of-the-sky using a modified Chandrasekhar-Fermi method estimate mass over flux ratios different regions use compar...

Visual and observer aerial surveys are important for monitoring wildlife populations but subject to visibility biases where animals may go undetected. The use of infrared technology in has the potential reduce biases, both when recording data retrospective processing footage, thus complements visible wavelength photography. We used video during marine mammal high-Arctic indirectly detected narw...